Structural Engineering and Mechanics

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Bond deterioration of corroded steel in two different concrete mixes

  • Zhou, Haijun (Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University) ;
  • Liang, Xuebing (Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University) ;
  • Wang, Zeqiang (Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University) ;
  • Zhang, Xiaolin (Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University) ;
  • Xing, Feng (Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University)
  • Received : 2016.10.28
  • Accepted : 2017.05.01
  • Published : 2017.09.25
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Abstract

This paper investigated the effects of rebar corrosion on bond performance between rebar and two different concrete mixes (compressive strengths of 20.7 MPa and 44.4 MPa). The specimen was designed as a rebar centrally embedded in a 200 mm concrete cube, with two stirrups around the rebar to supply confinement. An electrochemical accelerated corrosion technique was applied to corrode the rebar. 120 specimens of two different concrete mixes with various reinforcing steel corrosion levels were manufactured. The corrosion crack opening width and length were recorded in detail during and after the corrosion process. Three different loading schemes: monotonic pull-out load, 10 cycles of constant slip loading followed by pull-out and varied slip loading followed by pull-out, were carried out on the specimens. The effects of rebar corrosion with two different concrete mixes on corrosion crack opening, bond strength and corresponding slip value, initial slope of bond-slip curve, residual bond stress, mechanical interaction stress, and energy dissipation, were discussed in detail. The mean value and coefficient of variation of these parameters were also derived. It was found that the coefficient of variation of the parameters of the corroded specimens was larger than those with intact rebar. There is also obvious difference in the two different concrete mixes for the effects of rebar corrosion on bond-slip parameters.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Ministry of Science and Technology

References

  1. Almusallam, A.A., Al-Gahtani, A.S. and Aziz, A.R (1996), "Effect of steel corrosion on bond strength", Constr. Build. Mater., 10(2), 123-129. https://doi.org/10.1016/0950-0618(95)00077-1
  2. Bhargava, K., Ghosh, A., Mori, Y. and Ramanjam, S. (2008), "Suggested empirical models for corrosion-Induced bond degradation in reinforced concrete", ASCE J. Struct. Eng., 134, 221-230. https://doi.org/10.1061/(ASCE)0733-9445(2008)134:2(221)
  3. Chen, H.P. and Nepal, J. (2015), "Stochastic modelling and lifecycle performance assessment of bond strength of corroded reinforcement in concrete", Struct. Eng. Mech., 54(2), 319-336. https://doi.org/10.12989/sem.2015.54.2.319
  4. Coronelli, D., Hanjari, K.Z. and Lundgren, K. (2013), "Severely corroded RC with Cover Cracking", J. Struct. Eng., 139(139), 221-232. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000633
  5. Eligehausen, R., Popov, E.P. and Bertero, V.V. (1983), "Local bond stress-slip relationships of deformed bars under generalized excitations", EERC Report No. UCB/EERC-83/23, University of California at Berkeley, California.
  6. Everitt, B.S. (1998), The Cambridge Dictionary of Statistics, Cambridge University Press, Cambridge, UK, New York.
  7. Fang, C.Q., Gylltoft, K., Lundgren, K. and Plos, M. (2006), "Effect of corrosion on bond in reinforced concrete under cyclic loading", Cement Concrete Res., 36(3), 548-555. https://doi.org/10.1016/j.cemconres.2005.11.019
  8. Fang, C.Q., Lundgren, K., Chen, L. and Zhu, C. (2004), "Corrosion influence on bond in reinforced concrete", Cement Concrete Res., 34(11), 2159-2167. https://doi.org/10.1016/j.cemconres.2004.04.006
  9. Kivell, A. (2012), "Effects of bond deterioration due to corrosion on seismic performance of reinforced concrete structures", Thesis of University of Canterbury of New Zealand.
  10. Kivell, A., Palermo, A. and Scott A. (2015),"Complete model of corrosion-degraded cyclic bond performance in reinforced concrete", J. Struct. Eng., 141(9), 04014222. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001195
  11. Mangat, P.S. and Elgarf, M.S. (1999), "Bond characteristics of corroding steel in concrete beams", Mater. Struct., 32, 89-97. https://doi.org/10.1007/BF02479434
  12. Sæ ther, I. (2011), "Bond deterioration of corroded steel bars in concrete", Struct. Eng. Mech., 7(6), 415-429.
  13. Serhat, D. and Metin, H. (2015), "Investigation of bond-slip modeling methods used in FE analysis of RC members", Struct. Eng. Mech., 56(2), 275-291. https://doi.org/10.12989/sem.2015.56.2.275
  14. Shetty, A., Venkataramana, K. and Narayan K.S. B. (2014), "Flexural bond strength behaviour in OPC concrete of NBS beam for various corrosion levels", Struct. Eng. Mech., 49(1), 81-93. https://doi.org/10.12989/sem.2014.49.1.081
  15. Wu, Y.F. and Zhao, X.M. (2013), "Unified bond stress-slip model for reinforced concrete", ASCE J. Struct. Eng., 139(11), 1951-1962. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000747
  16. Xu, Y.L, Shen, W.D. and Wang, H. (1994), "An experimental study of bond anchorage properties of bars in concrete", J. Build. Struct., 3, 26-37.
  17. Yalciner, H., Eren, O. and Sensoy, S. (2012), "An experimental study on the bond strength between rebars and concrete as a function of concrete cover, strength and corrosion level", Cement Concrete Res., 42(5), 643-655. https://doi.org/10.1016/j.cemconres.2012.01.003
  18. Zhao, Y.X., Lin, H.W., Wu, K. and Jin, W.L. (2013), "Bond behaviour of normal/recycled concrete and corroded steel bars", Constr. Build. Mater.., 48, 348-359. https://doi.org/10.1016/j.conbuildmat.2013.06.091
  19. Zhou, H.J., Lu, J.L., Xv, X., Zhou, Y.W. and Xing F. (2015a), "Experimental study of bond-slip performance of corroded reinforced concrete under cyclic loading", Adv. Mech. Eng., 7(3), 1687814015573787.
  20. Zhou, H.J., Xv, X., Dong, B.Q. and Xing, F. (2015b), "Effects of stirrup corrosion on bond-slip performance of reinforcing steel in concrete: An experimental study", Constr. Build. Mater., 93, 257-266. https://doi.org/10.1016/j.conbuildmat.2015.05.122